# Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta…

By Steven Van · 2026-09-23

Cache diagnostics no longer needs a beta header; opting in just requires adding a diagnostics object to a Messages request.

The [Anthropic](<https://creatorstoolbox.com/tools/anthropic>) [Claude API's cache diagnostics](<https://platform.claude.com/docs/en/build-with-claude/cache-diagnostics>) feature is now out of beta and no longer requires the cache-diagnosis-2026-04-07 beta header. Developers opt in by including the diagnostics object on a Messages request; requests that still send the old beta header continue to work as before. Responses from POST /v1/messages now always include a diagnostics field, which is null when the request didn't include the diagnostics object. When present, it reports where consecutive requests diverged, such as a changed model, system prompt, tools list, or message history, so developers can find why a prompt cache missed instead of guessing.

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Anthropic

Anthropic is an AI safety and research company that's working to build reliable, interpretable, and steerable AI systems.

[View Anthropic →](<https://creatorstoolbox.com/tools/anthropic>)

[Read the original announcement →](<https://platform.claude.com/docs/en/build-with-claude/cache-diagnostics>)

[Read Cache diagnostics is out of beta on the Claude API and no longer requires the cache-diagnosis-2026-04-07 beta… on Creators Toolbox](<https://creatorstoolbox.com/blog/anthropic-cache-diagnostics-is-out-of-beta-on-the-claude-api-and-no-longer-requi>)

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